Container device for the storage of hazardous materials and a method of making it

A method of making a container device for storing hazardous material, especially a heat generating material, such as radioactive nuclear fuel, characterized by

• placing a formwork section which comprises a bottom part having a central opening and which further comprises a cylindrical jacket on a casting bed,
• placing a group of cylindrical storage containers, which have approximately the same height as the jacket of the formwork section and form compartments for holding the hazardous material in an upright position adjacent to one another on the bottom part of the formwork section adjacent to and around the central opening, so that the group of storage containers define a cylindrical cavity jointly with the jacket, the bottom part of the formwork section and, if required, also wall elements bridging gaps between the storage containers,
• filling the cylindrical cavity with concrete to form the concrete body, and
• mounting an upper end plate having a central opening corresponding to the central opening of the lower end plate on top of the jacket and the group of storage vessels.